Open porous, flow-through structures have a high surface-to-volume ratio and therefore a high heat transfer between the structure and the fluid. In addition, copper and copper alloys have excellent thermal conductivity and are therefore suitable for applications that require a high cooling capacity (e.g. magnetron sputtering). Selective laser powder bed fusion (PBF LB/M) offers the possibility of producing highly complex internal structures from copper and copper alloys and thus increasing the cooling capacity. This contribution shows improved heat conduction of open-pored cooling structures for magnetron sputtering applications. For this purpose, lattice structures with targeted porosity were produced and characterized using PBF LB/M made of pure copper and the hardenable alloy CuCr1Zr. The geometric accuracy of the lattice structures was evaluated by destructive and non-destructive testing and increased by adapting the process parameters. The heat transfer of selected porous structures was determined experimentally